2. Using the Tutorial Examples
3. Getting Started with Web Applications
5. JavaServer Pages Technology
7. JavaServer Pages Standard Tag Library
10. JavaServer Faces Technology
11. Using JavaServer Faces Technology in JSP Pages
12. Developing with JavaServer Faces Technology
13. Creating Custom UI Components
14. Configuring JavaServer Faces Applications
15. Internationalizing and Localizing Web Applications
16. Building Web Services with JAX-WS
17. Binding between XML Schema and Java Classes
19. SOAP with Attachments API for Java
21. Getting Started with Enterprise Beans
23. A Message-Driven Bean Example
24. Introduction to the Java Persistence API
25. Persistence in the Web Tier
26. Persistence in the EJB Tier
27. The Java Persistence Query Language
28. Introduction to Security in the Java EE Platform
29. Securing Java EE Applications
31. The Java Message Service API
32. Java EE Examples Using the JMS API
Container-Managed Transactions
Summary of Transaction Attributes
Setting Transaction Attributes
Rolling Back a Container-Managed Transaction
Synchronizing a Session Bean's Instance Variables
Methods Not Allowed in Container-Managed Transactions
Methods Not Allowed in Bean-Managed Transactions
Transactions in Web Components
36. The Coffee Break Application
Chapter 33
Transactions
A typical enterprise application accesses and stores information in one or more databases. Becausethis information is critical for business operations, it must be accurate, current, andreliable. Data integrity would be lost if multiple programs were allowed to updatethe same information simultaneously. It would also be lost if a system thatfailed while processing a business transaction were to leave the affected data onlypartially updated. By preventing both of these scenarios, software transactions ensure data integrity.Transactions control the concurrent access of data by multiple programs. In the eventof a system failure, transactions make sure that after recovery the data will bein a consistent state.
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